Abstract
Post-collision felsic rocks in Southeastern Yunnan province contain granodiorites. U-Pb zircon ages, geochemical data and Sr-Nd isotopic data for these rocks are reported in the present paper. Laser ablation inductively coupled plasma mass spectrometry U-Pb zircon analyses yielded consistent age 252.5 ± 1.0 Ma for one sample of the felsic rocks. The granodiorites were characterized by variational and high (87Sr/86Sr)i, ranging from 0.7223 to 0.7236 and very low eNd (t) values from –29.1 to –30.4. In addition, these rocks are characterized by slight Eu negative anomalies, Nb, Ta, Ti and Sr negative anomalies on primitive mantle normalization spider. Geochemical and isotopic characteristics suggest that these rocks were derived from an enriched crust source. The granodiorites resulted from the fractionation of potassium feldspar, plagioclase and ilmenite or rutile. However, the granodiorites were unaffected by visible crustal contamination during ascent. As a result, the granodiorites may have been formed due to partial melting of crust-derived sedimentary rocks beneath southeastern Yunnan province, southern China.
Highlights
IntroductionFelsic rocks (e.g., granite, granodiorite, etc.) are widely distributed in Honghe polymetallic deposits (super-large Sn, Cu, Pb, Zn, Sb, Ag, Mo, Au and Bi deposits) [1,2,3,4,5,6] and Bainiuchang super-large Ag-Pb-Zn polymetallic deposits [7,8,9,10,11,12,13,14]
Felsic rocks are widely distributed in Honghe polymetallic deposits [1,2,3,4,5,6] and Bainiuchang super-large Ag-Pb-Zn polymetallic deposits [7,8,9,10,11,12,13,14]
A total of 18 grains have a weighted mean 206Pb/238U age of 252.5 ± 1.0 Ma (1σ) (95% confidence interval) for GL01 (Table 1; Figure 3). These determinations are the best estimates of the crystallization ages of the granodiorites
Summary
Felsic rocks (e.g., granite, granodiorite, etc.) are widely distributed in Honghe polymetallic deposits (super-large Sn, Cu, Pb, Zn, Sb, Ag, Mo, Au and Bi deposits) [1,2,3,4,5,6] and Bainiuchang super-large Ag-Pb-Zn polymetallic deposits [7,8,9,10,11,12,13,14]. A number of studies about deposits have been carried out, recent analytical techniques and systematic geochemical studies (e.g., ages, geochemical data and isotopic data) on granites and granodiorites are limited. We provide systematic geochemical data and LA-ICP-MS zircon U-Pb and Sr-Nd data for the granodiorites to constrain age, source, fractionation and genetic model of the studied felsic rocks
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